著者

Kazuhiro Nogita Stuart D. McDonald Arne K. Dahle

出版者

The Japan Institute of Metals and Materials

雑誌

MATERIALS TRANSACTIONS (ISSN:13459678)

巻号頁・発行日

vol.45, no.2, pp.323-326, 2004 (Released:2005-06-24)

参考文献数

13

被引用文献数

115 177

---

The effects of different concentrations of individual additions of rare earth metals (La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu) on eutectic modification in Al-10 mass%Si has been studied by thermal analysis and optical microscopy. According to the twin-plane reentrant edge (TPRE) and impurity induced twinning mechanism, rare earth metals with atomic radii of about 1.65 times larger than that of silicon, are possible candidates for eutectic modification. All of the rare earth elements caused a depression of the eutectic growth temperature, but only Eu modified the eutectic silicon to a fibrous morphology. At best, the remaining elements resulted in only a small degree of refinement of the plate-like silicon. The samples were also quenched during the eutectic arrest to examine the eutectic solidification modes. Many of the rare-earth additions significantly altered the eutectic solidification mode from that of the unmodified alloy. It is concluded that the impurity induced twinning model of modification, based on atomic radius alone, is inadequate and other mechanisms are essential for the modification process. Furthermore, modification and the eutectic nucleation and growth modes are controlled independently of each other.

著者

大西 昇 川野 隆明 増子 富彦 SMITH S.C. STUART D.

出版者

日本育種学会

雑誌

育種學雜誌 (ISSN:05363683)

巻号頁・発行日

vol.38, no.2, pp.44-45, 1988

著者

Picken Stuart D.B.

出版者

国際基督教大学キリスト教と文化研究所

雑誌

人文科学研究 (ISSN:00733938)

巻号頁・発行日

no.21, pp.p161-175, 1987-12